Powerful Wind & Low Noise This clip fan is built in upgraded brushless motor, small but mighty and feel the airflow 10ft away. The maximum working decibel is just 40db, it will not disturb you at all when you are working or sleeping. Strong Grip Clamp Easily clip on to any surface, even running upside down and still be adjusted to point in every direction. This personal fan comes equipped easy-to-open clamp, which can clip on objective of thickness within 2.5 inches. Moreover, the soft rubber on clamp will never cause any scratch. High Compatibility USB-powered :The SmartDevil USB fan is powered by USB Cord and compatible with PC/laptop, power bank, AC adapter, car charger and other USB-enabled power supply.USB fan is energy-saving and environmentally friendly. (Note:This fan does not carry a battery) Space-saving Design Small compact clip & desk 2-in-1 fan fits into any room corner without taking up too much space, a welcome addition to your bedroom, study, office, etc. 360 Degree Rotation & 18-Month Warranty 360 degree vertical and horizontal adjustment,enjoying the cool air from any directions and keeping you cool all the time. Our provide worry-free 18-month warranty and friendly customer service. Please feel free to contact us if any problems. Well reply in 24 hours.